A grouting device for coal mine roof support

Abstract

The application discloses a grouting device for coal mine roof support and relates to the technical field of coal mining. The grouting device comprises a mobile vehicle body, a workbench arranged on the mobile vehicle body, a rotating mechanism arranged on the workbench, a lifting mechanism arranged on the rotating mechanism, a multi-hole fan-shaped spray head connected to the top end of the lifting mechanism through a spherical hinge, a deposition-preventing stirring tank and a water storage tank fixed on the workbench, a feeding port and a water inlet arranged on the deposition-preventing stirring tank, flow monitoring modules arranged at the feeding port and the water inlet and electromagnetic valves installed on the flow monitoring modules, a water pump connecting the water inlet with the water storage tank, a stirring mechanism arranged in the deposition-preventing stirring tank, a blocking-preventing vibration module arranged outside the deposition-preventing stirring tank, a mud conveying pipe connecting the deposition-preventing stirring tank with the multi-hole fan-shaped spray head, a mud pump arranged on the mud conveying pipe and a viscosity monitoring module arranged in the deposition-preventing stirring tank. The grouting device can realize integrated operation of accurate proportioning of grouting materials, blocking-preventing stirring and all-around grouting, improves operation efficiency and grouting quality and avoids dust pollution of the operation environment.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a shotcrete device for roof support in coal mines. Background Technology

[0002] During coal mining, the stability of the roof of the coal mine roadway is directly related to the safety of mining operations. If the roof is not properly supported, it can easily lead to safety accidents such as roof collapse, threatening the lives of construction workers and affecting mining efficiency. Currently, coal mine roof shotcreting operations are mostly carried out in stages using separate equipment. This involves independent mixing, conveying, and shotcreting equipment to complete the material mixing, conveying, and shotcreting processes separately, which has several drawbacks: First, the equipment is inconvenient to move, requiring additional auxiliary equipment for transport, resulting in poor operational flexibility and difficulty adapting to the limited space of coal mine roadways. Second, the fragmented operation process and poor coordination between equipment lead to low operational efficiency, and the numerous manual operation steps can easily cause uneven mixing and insufficient proportioning of filler materials, affecting shotcreting quality. Third, during the separate operation, dust leakage and material splashing are prone to occur during material mixing and conveying, polluting the working environment and endangering the health of construction workers. Fourth, the existing shotcreting equipment has limited operating angles and ranges, unstable conveying pressure, and is prone to pipeline blockage and insufficient shotcreting, making it difficult to adapt to the complex and uneven structure of coal mine roadway roofs, resulting in incomplete shotcreting support, insufficient stability, and an inability to effectively ensure coal mine safety. Summary of the Invention

[0003] The purpose of this invention is to provide a shotcrete device for coal mine roof support, which solves the problems existing in the prior art. It can realize the integrated operation of precise mixing of shotcrete materials, anti-clogging mixing, and all-round shotcrete, improve the operation efficiency and shotcrete quality, adapt to the needs of complex working environment in coal mine roadways, and avoid dust pollution of the working environment, thus ensuring the health of construction personnel.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides a shotcrete device for coal mine roof support, comprising a mobile vehicle body with a worktable on the vehicle body, a rotating mechanism on the worktable, a lifting mechanism on the rotating mechanism, a multi-hole fan-shaped nozzle with a ball hinge at the top of the lifting mechanism, an anti-settling mixing tank and a water storage tank fixed on the worktable, the anti-settling mixing tank having a feed inlet and a water inlet, both equipped with flow monitoring modules for monitoring the feed rate at the feed inlet and the water rate at the water inlet, both equipped with solenoid valves, the water storage tank being connected to the water inlet via a water pump, the anti-settling mixing tank having a mixing mechanism inside and an anti-clogging vibration module externally, the anti-settling mixing tank being connected to the multi-hole fan-shaped nozzle via a mud conveying pipe with a mud pump, and a viscosity monitoring module inside the anti-settling mixing tank for monitoring the viscosity of the mixed slurry.

[0005] In one embodiment, the front of the mobile vehicle body is provided with a top plate roughness sensor and an obstacle avoidance sensor.

[0006] In one embodiment, the mobile vehicle body is provided with a transverse track, and the worktable is slidably disposed on the transverse track.

[0007] In one embodiment, the anti-deposition stirring tank is equipped with a spray uniformity sensor.

[0008] In one embodiment, both the anti-settling stirring tank and the water storage tank are equipped with liquid level detection devices.

[0009] In one embodiment, the bottom of the mobile vehicle body is provided with trackless rubber wheels.

[0010] In one embodiment, the stirring mechanism includes a power unit, a stirring shaft, and stirring blades. The output end of the power unit is connected to the stirring shaft, and the stirring blades are fixed on the stirring shaft.

[0011] In one embodiment, the water storage tank is provided with a water inlet.

[0012] In one embodiment, the water storage tank is provided with a water outlet, which is connected to the water inlet of the water pump via a pipeline, and the water outlet of the water pump is connected to the anti-settling stirring tank via a pipeline.

[0013] The present invention achieves the following technical effects compared to the prior art: The shotcrete device for coal mine roof support provided by this invention can be moved to the area to be shotcreted by a mobile vehicle. Shotcrete material is added to the anti-settling mixing tank through the feed inlet. A water pump pumps water from a storage tank into the anti-settling mixing tank to mix with the material. A flow monitoring module monitors the feed rate at the feed inlet and the water rate at the water inlet to ensure accurate spraying ratio. A viscosity monitoring module monitors the viscosity of the mixed slurry (a mixture of material and water) in real time. Combined with the flow monitoring module and solenoid valve, this makes the spraying ratio more precise. The airtight design of the anti-settling mixing tank prevents dust leakage and material splashing during mixing, avoiding dust pollution. The system is designed to improve the working environment and ensure the health of construction workers. The anti-vibration module eliminates material clumping, prevents pipe blockage, and ensures the stable performance of the shotcrete material. It also prevents uneven mixing or clumping from affecting the support effect. Through the rotating mechanism, lifting mechanism, and the hinged connection structure between the multi-hole fan-shaped nozzle and the lifting mechanism, the multi-hole fan-shaped nozzle can rotate at multiple angles in the horizontal plane and flexibly adjust and accurately position its height in the vertical direction. This allows the multi-hole fan-shaped nozzle to accurately reach the shotcrete area at different heights and positions on the coal mine roof, adapting to the complex spatial structure of coal mine roadways. It can greatly improve work efficiency and shotcrete quality, meeting the needs of the complex working environment in coal mine roadways. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a shotcrete device for coal mine roof support in an embodiment of the present invention. Figure 2 This is a front view of a shotcrete device for coal mine roof support in an embodiment of the present invention; Figure 3 This is a top view of a shotcrete device for coal mine roof support in an embodiment of the present invention; Figure 4 This is a schematic diagram of the anti-deposition stirring tank in an embodiment of the present invention.

[0016] In the diagram: 1-Mobile vehicle body, 2-Workbench, 3-Rotating mechanism, 4-Lifting mechanism, 5-Multi-hole fan-shaped nozzle, 6-Anti-settling mixing tank, 7-Water storage tank, 8-Liquid level detection device, 9-Feed inlet, 10-Water injection port, 11-Slurry conveying pipe, 12-Slurry pump, 13-Top plate roughness sensor, 14-Obstacle avoidance sensor, 15-Transverse track, 16-Spray uniformity sensor, 17-Trackless rubber wheel, 18-Water outlet, 19-Power unit, 20-Mixing shaft, 21-Mixing blade, 22-Water inlet, 23-Water pump, 24-Viscosity monitoring module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The purpose of this invention is to provide a shotcrete device for coal mine roof support, which solves the problems existing in the prior art. It can realize the integrated operation of precise mixing of shotcrete materials, anti-clogging mixing, and all-round shotcrete, improve the operation efficiency and shotcrete quality, adapt to the needs of complex working environment in coal mine roadways, and avoid dust pollution of the working environment, thus ensuring the health of construction personnel.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figures 1-4As shown, this embodiment provides a shotcrete device for coal mine roof support, including a mobile vehicle 1. The mobile vehicle 1 serves as a mobile carrier, equipped with a power unit and trackless rubber wheels 17 at the bottom, allowing free movement within the coal mine operating area to meet the shotcrete requirements of different operating areas. It offers flexible operation. The bottom of the mobile vehicle 1 has an anti-slip limiting device that can be fixed to the coal yard ground, providing support and positioning for the entire device and preventing displacement and vibration during operation, ensuring operational safety. The mobile vehicle 1 has a worktable 2, a rotating mechanism 3, and a lifting mechanism 4. The lifting mechanism 4 is a hydraulic lifting mechanism, with a multi-hole fan-shaped nozzle 5 ball-jointed at its top. The nozzle 5 is controlled by rotation... The hinged connection structure between mechanism 3, lifting mechanism 4, and the multi-hole fan-shaped nozzle 5 and lifting mechanism 4 allows the multi-hole fan-shaped nozzle 5 to rotate at multiple angles in the horizontal plane and to flexibly adjust and precisely position its height in the vertical direction. This enables the multi-hole fan-shaped nozzle 5 to accurately reach the spraying area at different heights and positions on the coal mine roof, adapting to the complex spatial structure of coal mine roadways. The workbench 2 is also equipped with an anti-settling mixing tank 6 and a water storage tank 7. The anti-settling mixing tank 6 has a feed inlet 9 and a water inlet 10. Both the feed inlet 9 and the water inlet 10 are equipped with flow monitoring modules to monitor the feed rate at the feed inlet 9 and the water rate at the water inlet 10. Both the feed inlet 9 and the water inlet 10 are equipped with solenoid valves. The water storage tank 7 is connected to the water inlet 10 via a water pump 23. Specifically, the water storage tank 7 is equipped with an outlet 18, which is connected to the inlet of the water pump 23 via a pipeline. The outlet of the water pump 23 is connected to the inlet 10 of the anti-settling mixing tank via a pipeline. The water pump 23 pumps water from the water storage tank 7 into the anti-settling mixing tank 6 to mix with the materials. The anti-settling mixing tank 6 is equipped with a mixing mechanism inside and an anti-clogging vibration module on the outside. The anti-settling mixing tank 6 is detachably connected to the mobile vehicle 1. The sealing of the anti-settling mixing tank 6 can prevent dust leakage and material splashing during the mixing process. The mixing mechanism is used to prevent the deposition of the coal mine roof spraying material and to uniformly mix the material. The anti-clogging vibration module is installed at the bottom left of the anti-settling mixing tank 6. The anti-clogging vibration module can eliminate the agglomeration of the spraying material and avoid blockage of the slurry delivery pipeline. To ensure the stability of the spraying material performance, both the anti-settling mixing tank 6 and the water storage tank 7 are equipped with a liquid level detection device 8 (liquid level sensor). The water storage tank 7 is equipped with a water inlet 22, through which water can be added to the water storage tank 7. The liquid level is detected by the liquid level detection device 8 in the water storage tank 7 to ensure sufficient water storage. The anti-settling mixing tank 6 is connected to the multi-hole fan-shaped nozzle 5 through the mud conveying pipe 11. The mud conveying pipe 11 is equipped with a mud pump 12. The multi-hole fan-shaped nozzle 5 is the spraying execution component, which integrates the spraying channel. The mud pump 12 is used to increase the conveying pressure of the spraying material and can provide a stable conveying pressure. It can pump the mixed spraying material into the multi-hole fan-shaped nozzle 5 and spray it accurately and stably to the part of the roadway to be sprayed.The anti-settling mixing tank 6 and the multi-hole fan-shaped nozzle 5 are connected by a mud conveying pipe 11 for quick disassembly, facilitating equipment maintenance, repair, and component replacement, and adapting to the needs of complex coal mine operating environments. When the liquid level detection device 8 in the anti-settling mixing tank 6 detects that the liquid level of the mixed slurry has reached the set value, it automatically stops feeding and water intake. The opening and closing of feeding and water intake are controlled by a solenoid valve to ensure the accuracy of the consistency and the amount of material in reserve, ensuring the correct spray ratio. The anti-settling mixing tank 6 is also equipped with a viscosity monitoring module 24, which (viscosity sensor) is used to monitor the viscosity of the sprayed slurry (a mixture of material and water). In conjunction with the flow monitoring module and the solenoid valve, the spray ratio is made more accurate.

[0021] In this embodiment, a top plate roughness sensor 13 and an obstacle avoidance sensor 14 are provided at the upper end of the front of the mobile vehicle body 1. A transverse track 15 is provided on the mobile vehicle body 1, and the worktable 2 is slidably disposed on the transverse track 15. The lateral position of the multi-hole fan-shaped nozzle 5 can be adjusted by the transverse movement of the worktable 2 on the transverse track 15.

[0022] In this embodiment, the anti-settling mixing tank 6 is equipped with a spray uniformity sensor 16, which can monitor the spraying effect on the working surface.

[0023] In this embodiment, the stirring mechanism includes a power unit 19, a stirring shaft 20, and stirring blades 21. The output end of the power unit 19 is connected to the stirring shaft 20, and the stirring blades 21 are fixed on the stirring shaft 20. The power unit 19 drives the stirring shaft 20 to rotate, thereby stirring the slurry through the stirring blades 21.

[0024] In this embodiment, the ball joint connection structure between the lifting mechanism 4 and the multi-hole fan-shaped nozzle 5 includes a ball head and a ball socket. The ball head rotates within the ball socket, and the rotation range of the ball head is limited by the ball socket to control the operating pitch angle range of the multi-hole fan-shaped nozzle 5, which is 0°-160°.

[0025] The work process is as follows: Before operation, the device is moved to the designated working position in the coal mine roadway using trackless rubber wheels 17. The anti-slip limiting device at the bottom of the mobile vehicle 1 is firmly attached to the working surface to fix the device in place and prevent displacement during operation.

[0026] After fixing, connect the external spraying material supply pipeline through the feed inlet 9, connect the water inlet 22 to the external water supply pipeline, and connect the water injection inlet 10 to the water storage tank 7 through the water pump 23. Start the system, calibrate the flow monitoring module and viscosity monitoring module 24, and preset the spraying material mixing ratio parameters and the liquid level thresholds of the anti-settling mixing tank 6 and the water storage tank 7.

[0027] Close the machine cover to ensure the anti-settling mixing tank 6 is sealed. The feeding program is started via PLC control. The flow monitoring module measures the feed flow and water flow in real time, activating the power unit 19 of the mixing mechanism to drive the mixing blades 21 to uniformly mix the sprayed material, eliminating the risk of material agglomeration and ensuring uniform mixing. The viscosity monitoring module 24 monitors the material viscosity in real time, intelligently controlling the solenoid valve to control the feeding speed and automatically controlling the material ratio. Once the liquid level in the anti-settling mixing tank 6 reaches the set threshold, the solenoid valve closes, prohibiting feeding. The liquid level detection device in the water storage tank 7 monitors the water level in real time to ensure sufficient water storage.

[0028] After the mixing and batching are completed, the anti-clogging vibration module can maintain low power operation to prevent the material from clumping and blocking the pipeline before conveying.

[0029] The system uses data collected by a roof roughness sensor to determine the position, angle, and spraying requirements of the area to be sprayed on the roof. The spraying height is adjusted by a lifting mechanism 4, and the horizontal rotation angle is adjusted by a rotating mechanism 3. A ball joint mechanism is used to adjust the working angle of the multi-hole fan-shaped nozzle 5 installed at the end within the range of 0°-160°, aligning the spraying channel with the area to be sprayed. According to the working distance and spraying requirements, the control mud pump 12 is activated to output pressure and deliver the spraying material through the mud delivery pipe 11 to the multi-hole fan-shaped nozzle 5, which then sprays the slurry onto the working surface. During spraying, the flow rate is monitored by a flow detection device, and the control system can adjust the spraying speed according to the spraying requirements. A roof roughness sensor 13 and a spray uniformity sensor 16 monitor the working surface condition and the spraying effect.

[0030] If lateral operation is required, the system will adjust the worktable 2 to move along the lateral track 15 to adjust the lateral operation position. If a larger range of movement is required, the entire device can be flexibly moved to a new position via the moving vehicle 1. After repositioning, the above operation process will be repeated. Obstacle avoidance sensor 14 assists in moving and avoiding obstacles.

[0031] During operation, if the system detects abnormal pipeline pressure, the anti-blockage vibration module will automatically increase its power to vibrate and clear the blockage, eliminating potential blockage risks and ensuring continuous operation.

[0032] After the work is completed, the mud delivery pipe 11 and other pipeline connections can be quickly disassembled, and the anti-settling mixing tank 6, mixing blades 21, multi-hole fan-shaped nozzles 5, and the inside of the delivery pipeline can be cleaned. At the same time, check the condition of each component and perform necessary maintenance or replacement for the next use.

[0033] This device integrates functions such as shotcrete material proportioning, anti-clogging mixing, stable conveying, and universal spraying, eliminating the need for separate equipment for step-by-step operation, reducing work processes, improving the efficiency of shotcrete application on coal mine roofs, shortening equipment handling and debugging time, and saving manpower.

[0034] The anti-settling mixing tank 6 in this device adopts a sealed slurry storage tank and is equipped with mixing blades 21, anti-clogging vibration modules, etc., which can prevent dust leakage and material splashing, ensuring the health of the working environment and construction personnel, while ensuring that the slurry material does not clump and does not run, thus ensuring the quality of the slurry. The flow monitoring module and viscosity monitoring module 24, together with the solenoid valve, ensure the accurate proportion of the slurry material. The mud pump 12 provides stable pressure to ensure the accurate and stable slurry spraying, improving the stability and quality of the slurry.

[0035] This device adjusts the pitch angle (0°-160°), working height, and working position of the multi-hole fan-shaped nozzle 5 through the lifting mechanism 4, the rotating mechanism 3, and the ball joint mechanism. It can adjust the angle, working height, and working position of the multi-hole fan-shaped nozzle 5 to meet the working conditions of uneven roof in coal mine roadways.

[0036] The key components of this device are detachable, which facilitates inspection, maintenance, and component replacement. It can meet the requirements of harsh and complex working conditions in coal mines, extend service life, and save costs. The anti-vibration module can improve the unstable conveying pressure and pipeline blockage of the device, ensuring continuous operation.

[0037] In summary, this invention has a simple structure and is easy to operate. It can achieve integrated spraying of coal mine roof, resulting in efficient, precise, and stable spraying of the coal mine roof. It improves the safety factor of coal mining while saving costs, and has great practicality and promotion value.

[0038] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A shotcrete device for roof support in coal mines, characterized in that: The system includes a mobile vehicle body with a worktable. The worktable has a rotating mechanism and a lifting mechanism. A multi-hole fan-shaped nozzle is ball-hinged to the top of the lifting mechanism. An anti-settling mixing tank and a water storage tank are also fixed on the worktable. The anti-settling mixing tank has a feed inlet and a water inlet, both equipped with flow monitoring modules to monitor the feed rate and water flow rate. Both the feed inlet and water inlet are equipped with solenoid valves. The water storage tank is connected to the water inlet via a water pump. The anti-settling mixing tank contains a mixing mechanism and is externally equipped with an anti-clogging vibration module. The anti-settling mixing tank is connected to the multi-hole fan-shaped nozzle via a mud delivery pipe, which is equipped with a mud pump. The anti-settling mixing tank also contains a viscosity monitoring module to monitor the viscosity of the mixed slurry.

2. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The front of the mobile vehicle is equipped with a roof roughness sensor and an obstacle avoidance sensor.

3. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The mobile vehicle body is equipped with a transverse track, and the worktable is slidably mounted on the transverse track.

4. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The anti-settling mixing tank is equipped with a spray uniformity sensor.

5. The shotcrete device for coal mine roof support according to claim 1, characterized in that: Both the anti-settling mixing tank and the water storage tank are equipped with liquid level detection devices.

6. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The bottom of the mobile vehicle is equipped with trackless rubber wheels.

7. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The stirring mechanism includes a power unit, a stirring shaft, and stirring blades. The output end of the power unit is connected to the stirring shaft, and the stirring blades are fixed on the stirring shaft.

8. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The water storage tank is equipped with a water inlet.

9. The shotcrete device for coal mine roof support according to claim 1, characterized in that: The water storage tank is equipped with a water outlet, which is connected to the water inlet of the water pump via a pipeline, and the water outlet of the water pump is connected to the anti-settling stirring tank via a pipeline.

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